Originally Posted by ZapperO

Yes. They do. I just went and checked and yes, it IS an option! Here is the exact language:

"When paying with cash, your reservation will be held until 11:59 p.m. MT on Saturday, Mar 28, 2009 (e.g. the next day). You will have until that time to complete your purchase at any Western Union location or your reservation will be cancelled. A Western Union service fee of $9.95 USD will apply within the U.S., $19.95 CAD within Canada, and $15.00 USD anywhere else. To find a Western Union location near you, click here. "